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POST
/
v1
/
images
/
generations
# model can be "gemini-3-pro-image-preview", or the compatible alias "nano-banana-pro-ext"
curl --request POST \
  --url https://api.apimart.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3-pro-image-preview",
    "prompt": "A bamboo forest path under moonlight",
    "size": "1:1",
    "n": 1,
    "resolution": "1K"
  }'

{
  "code": 200,
  "data": [
    {
      "status": "submitted",
      "task_id": "task_01K8SGYNNNVBQTXNR4MM964S7K"
    }
  ]
}
Model name compatibility note: This endpoint also accepts the alias nano-banana-pro-ext, which is equivalent to gemini-3-pro-image-preview. The two are interchangeable and produce identical results.
# model can be "gemini-3-pro-image-preview", or the compatible alias "nano-banana-pro-ext"
curl --request POST \
  --url https://api.apimart.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gemini-3-pro-image-preview",
    "prompt": "A bamboo forest path under moonlight",
    "size": "1:1",
    "n": 1,
    "resolution": "1K"
  }'

{
  "code": 200,
  "data": [
    {
      "status": "submitted",
      "task_id": "task_01K8SGYNNNVBQTXNR4MM964S7K"
    }
  ]
}

​
Authorizations

​
Authorization
string
required
All APIs require authentication using Bearer TokenGet API Key:Visit API Key Management Page to obtain your API KeyAdd to request header:
Authorization: Bearer YOUR_API_KEY

​
Body

​
model
string
default:"gemini-3-pro-image-preview"
required
Image generation model nameSupported models:
  • gemini-3-pro-image-preview - Standard version (compatible alias nano-banana-pro-ext)
  • gemini-3-pro-image-preview-official - Official version (compatible alias nano-banana-pro)
Example: "gemini-3-pro-image-preview" or "gemini-3-pro-image-preview-official"
For backward compatibility, the aliases nano-banana-pro-ext (for gemini-3-pro-image-preview) and nano-banana-pro (for gemini-3-pro-image-preview-official) remain usable.
​
prompt
string
required
Text description for image generation
​
size
string
Image generation sizeSupported formats:
  • Ratios: auto, 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
For text-to-image, when size is auto, the default is 1:1 or 16:9; for image-to-image, the aspect ratio follows the upstream response. We recommend specifying an aspect ratio.
​
n
integer
Number of images to generateRange: 1Default: 1⚠️ Note: Must be a pure number (e.g. 1), do not add quotes, otherwise it will error
​
resolution
string
Output image resolutionSupported values:
  • 1K - 1K resolution (default)
  • 2K - 2K resolution
  • 4K - 4K resolution
⚠️ Note: Generating 4K images with base64 format takes longer processing time
​
official_fallback
boolean
default:"false"
Whether to use the official channel fallback
  • false: Do not use (default)
  • true: Use official channel
When using the official channel (gemini-3-pro-image-preview-official), this parameter cannot be used.
​
image_urls
array
List of reference image URLs for image-to-image or image editing💡 Quick Fill (Try it area):
  1. Click ”+ Add an item” to add an image URL
  2. Enter the complete image URL address or base64 data
Limit: Maximum 14 images

​
Response

​
code
integer
Response status code
​
data
array
Response data array